A hepaticcyst, cystofliver, is commonly referred to as a “blister” in the liver. The vast majority of liver cysts are congenital, that is, they are caused by some abnormality in congenital development. Acquired factors are rare, such as parasitic cysts in the liver in pastoral areas where people have contracted encapsulated cysticercosis. Trauma, inflammation, and even tumors can also cause liver cysts. Cysts can be solitary, just one, as small as 0.2 cm; or they can be as many as ten or dozens, or even one can be as large as tens of centimeters. Patients with polycystic liver cysts are sometimes combined with cysts of other internal organs, such as concomitant renal cysts, pulmonary cysts and occasionally pancreatic cysts and splenic cysts. In polycystic liver, cysts may cover the liver, and some patients often have upper abdominal mass as the first symptom, and in the end stage, ascites, portal hypertension and other symptoms of liver insufficiency. Liver cysts are usually asymptomatic. When the cyst grows to a certain extent, it may compress the gastrointestinal tract and cause symptoms, such as epigastric discomfort and fullness; there are also cases of abdominal pain and fever due to secondary bacterial infection of the cyst. With the development and popularity of diagnostic imaging, especially ultrasound has been listed as one of the routine physical examinations of the population, and the detection rate of ultrasound for liver cysts can reach 98%, so many of this disease is found. In people’s mind, a cyst is a tumor growing on top of the liver, even though there are not much symptoms, it is also very uneasy, will it turn into liver cancer? The common complications of liver cysts are rupture and bleeding, bacterial infection, fistula and penetration, while cancer is rare. Congenital liver cysts are absolutely not cancerous. Liver cyst is a relatively common benign disease of the liver, which can be divided into parasitic, non-parasitic and congenital hereditary. Most of the causes of liver cysts are due to developmental disorders of small intrahepatic bile ducts, and the occurrence of solitary liver cysts is due to ectopic bile ducts. The clinical manifestations vary with the location, size and number of cysts, as well as with the presence or absence of compression of adjacent organs and complications. The cyst will neither affect liver function nor develop into liver cancer, so it is usually not necessary to take care of it, as long as it is reviewed regularly. However, if it grows too large and makes the patient feel uncomfortable, it can be treated. The doctor can insert a thin needle into the cyst under the guidance of ultrasound and use the thin needle to draw out the fluid inside the cyst and then inject pure alcohol so that the cyst will not grow again. If the cyst grows very large and the patient feels painful, open surgery can also be considered to remove the cyst along with the membrane of the cyst to solve the patient’s pain.